Sequence alignment between 6hqb(J) and UniProt seq Q55329 (PSAJ_SYNY3):

Q55329 (PSAJ_SYNY3): Photosystem I reaction center subunit IX from Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa) 
                 10        20        30        40
         ---------+---------+---------+---------+
UniProt: MDGLKSFLSTAPVMIMALLTFTAGILIEFNRFYPDLLFHP
PDB seq: MDGLKSFLSTAPVMIMALLTFTAGILIEFNRFYPDLLFHP
         ---------+---------+---------+---------+
                 10        20        30        40